# Grammarly, ProWritingAid and LanguageTool compared on what their documentation says about data

Source: https://digicruncher.com/topic/grammarly-prowritingaid-and-languagetool-compared-on-what-their/
Site: DigiCruncher, category Reviews and tool comparisons
Published: 2026-11-09. Updated: 2026-11-09. Replies: 1.

## Question by Hollis B., 2026-11-09

I keep seeing the three big grammar checkers recommended to people who write for a living, and the recommendations never say a word about what happens to the text. I would like to do this the dull way: put Grammarly, ProWritingAid and LanguageTool side by side and compare only what each company's own documentation says about my writing. Is it used to train models? Is it stored? Can I switch things off?

I am not asking which one catches more errors. I know my own errors well enough. I am asking what a careful person should read before installing a browser extension that sees everything typed into a text box. If you have read these pages, tell me which lines mattered and where the pages are vague, and please say which tool and which plan you mean.

## Reply 1 by Marisol Q., 2026-11-09

Read the privacy policy and the product help pages together, because they answer different questions. The policy says what the company may do in general. The help page says what a given toggle does. When they disagree, I trust neither until I have asked support in writing. Also check whether the extension reads every page or only the field you are in.

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Cite as: DigiCruncher, "Grammarly, ProWritingAid and LanguageTool compared on what their documentation says about data", https://digicruncher.com/topic/grammarly-prowritingaid-and-languagetool-compared-on-what-their/, accessed 2026-11-09.